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    Re: Gary LaPook's Digital Watch Experiment
    From: Zvi Doron
    Date: 2012 Mar 7, 20:46 -0000

    Well, one thing that went straight back to Amazon the way it came was that
    made in China Casio G-Shock DW5600E. Dark grey, muddy, low contrast and
    difficult to read LCD screen plus a rate of about -20 seconds per month
    (worst case defined by Casio as + - 15 but Japanese and Thai made examples
    doing much better than that) were enough for me. Compare that to the tiny
    ancient 1980s made in Japan Casio F-84W with its incredibly bright crisp
    clear screen and a rate of -8 seconds per month.
    My little experiment continues with the little Casio and the Timex
    Expedition joined also by a Polar F5 heart rate monitor, of all things, that
    appears surprisingly accurate in time keeping, and by another cheap and
    cheerful Casio F-108 WH. Rather than continually calculating rates, I simply
    plot the errors of the watches against days passed since setting them to GMT
    on a single graph paper. Will report progress in a future post in a couple
    of months.
    -----Original Message-----
    From: Zvi Doron
    Sent: Wednesday, February 29, 2012 7:51 PM
    To: zvidoron@btinternet.com
    Subject: [NavList] Re: Gary LaPook's Digital Watch Experiment
    Hi Alan and thanks for your reply. Great customer service from Casio.
    As your watch has the "Atomic" feature, basically a regular radio update
    from a very precise time source, it is to be expected that it would keep
    precise time - as long as it is within radio reception range of the time
    signal of course.
    I am more interested in the accuracy of quartz watches that do not have this
    feature and are left on their own to gain or lose time - hopefully at a very
    slow, constant and predictable rate which would turn them into
    mini-chronometers usable anywhere in the world, radio reception or not.
    I have actually just ordered such a watch - or so I hope - also a Casio
    G-Shock, model DW5600E-V1, which is probably the simplest G-Shock available.
    I am assured of its sturdiness - there are wonderful videos on YouTube of
    the thing being taken out of the freezer, tied to a rotating hand drill to
    be slapped repeatedly on a wooden board before being dropped into a boiling
    pot of water for 30 seconds. It still worked after that. I am more curious
    about its accuracy and predictability and that will take some time to test
    and tell. I have a feeling it will not be much better than the little old
    strapless 1984 Casio I already have.
    -----Original Message-----
    From: Alan S
    Sent: Wednesday, February 29, 2012 6:58 PM
    To: zvidoron---com
    Subject: [NavList] Re: Gary LaPook's Digital Watch Experiment
    Zvi Doron:
    On the subject of watch accuracy, I believe I had mentioned this previously,
    but for whatever it might be worth, my experience with the Casio G Shock
    "Atomic Watch" runs as follows. I'm on the second such watch, sent the first
    one back when the resin/plastic band failed after about 5 years of daily
    wearing. From conversation I had had with Casio, I expected return of my old
    watch, with a new band. They sent me an entirely new watch, and helped me
    set it up, as the original one had been.
    Respecting each of these watches, checking them against NIST/Naval
    Observatory Time on my computer or at the local public library, I can detect
    no discrepancy between time shown on the Casio and that obtained from  NIST
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